WM5615
Production Data
January 1997 Rev 2
10-Bit Digital-to-Analogue Converter
Description
The WM5615 is a 10-bit voltage output digital-to-
analogue converter (DAC) with a buffered reference input
(high impedance). The DAC produces a maximum output
voltage that is twice the reference voltage and the DAC is
monotonic. The device is simple to use, running from a
single supply of 5V. A power-on reset function is
incorporated to ensure repeatable start-up conditions.
Digital control of the WM5615 is over a 3-wire serial bus
that is CMOS compatible and easily interfaced to industry
standard microprocessor and microcontroller devices. The
device receives a 16-bit data word to produce the
analogue output. The digital inputs feature Schmitt
triggers for high noise immunity. Digital communication
protocols include the SPI
TM
, QSPI
TM
and Microwire
TM
stand-
ards.
The 8-terminal small-outline D package allows digital
control of analogue functions in space-critical applications.
The WM5615C is characterised for operation from 0
o
C to
70
o
C. The WM5615I is for operation from -40
o
C to 85
o
C.
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of
National Semiconductor Corp.
Features
•
•
•
•
•
•
•
•
•
•
•
10-bit CMOS voltage output DAC in an
8-terminal package
5V single supply operation
3-wire serial interface
High-impedance reference input
Maximum voltage output twice reference
input voltage
Internal power-on reset
Low power consumption ... 1.75mW max
877kHz update rate
Setting time to 0.5 LSB ... 12.5µs typical
µ
Monotonic over temperature
Pin compatible with the Maxim MAX515
Applications
•
•
•
•
•
Battery-powered test Instruments
Digital offset and gain adjustment
Battery-operated/remote industrial controls
Machine and motion control devices
Cellular telephones
Block Diagram
+
-
REFIN
5
VOUT
R
R
VDD
+
AGND
POWER-ON
RESET
RESISTOR
STRING
DAC
-
10-BIT DAC REGISTER
CS
SCLK
2
Xs
DIN
CONTROL
LOGIC
(LSB)
(MSB)
4
DUMMY
BITS
DOUT
16-BIT SHIFT REGISTER
Production Data
data sheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson Mi-
croelectronics standard terms and conditions.
Wolfson Microelectronics
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX. UK
© 1996 Wolfson Microelectronics
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
email: admin@wolfson.co.uk
www: http://www.wolfson.co.uk
WM5615
Pin Configuration
D or P package
Top View
DIN 1
SCLK 2
CS 3
DOUT 4
8 V
DD
7 VOUT
6 REFIN
5 AGND
Ordering Information
DEVICE
WM5615CD
WM5615CP
WM5615ID
WM5615IP
TEMP RANGE
0
o
C to +70
o
C
0
o
C to +70
o
C
-40
o
C to +85
o
C
-40
o
C to +85
o
C
PACKAGE
8 pin SO
8 pin DIP
8 pin SO
8 pin DIP
Absolute Maximum Ratings
Supply voltage (V
DD
to AGND) . . . . . . . . . . . . 7V
Digital input voltage range to AGND . .-0.3V to V
DD
+0.3V
Ref. input voltage range to AGND . . .-0.3V to V
DD
+ 0.3V
Output voltage at OUT from external source . .V
DD
+ 0.3V
Continuous current, any terminal . . . . . . . . ±20mA
Operating free-air temperature range T
A:
WM5615C . . . . . . . . . . . . . . . . . . 0
o
C to +70
o
C
WM5615I . . . . . . . . . . . . . . . . . -40
o
C to +85
o
C
Storage temperature range T
stg
. . . . . -65
o
C to +150
o
C
Lead temperature 1.6mm (1/16 inch)
from case for 10 seconds . . . . . . . . . . . . . .260
o
C
Note:
Stresses beyond those listed under 'Absolute Maximum Ratings' may cause damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under 'Recommended Operating Conditions' is not implied. Exposure to absolute maximum rated conditions for
extended periods may affect device reliability.
Recommended Operating Conditions
PARAMETER
Supply voltage
High-level digital input voltage
Low-level digital input voltage
Reference voltage to REFIN terminal
Load resistance
Operating free air temperature
SYMBOL
V
DD
V
IH
V
IL
V
ref
R
L
T
A
T
A
MIN
4.5
2.4
0
2
0
-40
TYP
5
MAX
5.5
0.8
V
DD
-2
70
85
UNIT
V
V
V
V
kΩ
o
C
o
C
2.048
WM5615C
WM5615I
Wolfson Microelectronics
2
WM5615
Electrical Characteristics
V
DD
= 5.0V ±5%, V
ref =
(over recommended operating free-air temperature range)
2.048V unless otherwise stated.
Static DAC Specifications
PARAMETER
Resolution
Integral nonlinearity
Differential nonlinearity
Zero scale error (offset error)
Zero scale error (offset error)
temperature coefficient
Gain error
Gain error temperature
coefficient
Power-supply rejection ratio
Analogue full scale output
SYMBOL
INL
DNL
E
ZS
(see
(see
(see
(see
CONDITIONS
note
note
note
note
1)
2)
3)
4)
MIN
10
+0.1
3
±3
1
0.1
0.1
2Vref(1023/1024)
±1
±0.5
±3
TYP
MAX
UNIT
bits
LSB
LSB
LSB
ppm/
o
C
LSB
ppm/
o
C
LSB/V
V
E
G
(see note 5)
(see note 6)
Offset (see notes 7 and 8)
Gain
R
L
= 100kΩ
PSRR
Notes:
1. The relative accuracy or integral nonlinearity (INL),
sometimes referred to as linearity error, is the
maximum deviation ot the output from the line
between zero and full scale, excluding the effect of
zero code and full scale errors (see text).
2. The differential nonlinearity (DNL), sometimes
referred to as differential error, is the difference
between the measured and ideal LSB amplitude
change of any two adjacent codes. Monotonic means
the output voltage changes in the same direction (or
remains constant) as a change in the digital input
code.
3. Zero-scale error is the deviation from zero voltage
output when the digital input is zero (see text)
4. Zero-scale error temperature coefficient is given by
E
ZS
TC = [E
ZS
(T
max
) - E
ZS
(T
min
)] /V
ref
x 10
6
/ (T
max-
T
min
)
5. Gain error is the deviation from the ideal output (Vref
- 1LSB) with an output load of 10kΩ, excluding the
effects of zero error.
6. Gain temperature coefficient is given by EG TC =
[E
G
(T
max
) - E
G
(T
min
)] /V
ref
x 10
6
/(T
max
-T
min
).
7. Zero-scale offset error rejection ratio (E
ZS
-RR) is
measured by varying the V
DD
from 4.5V to 5.5V DC
and measuring the proportion of this signal imposed
on the zero-code output voltage.
8. Gain error rejection ratio (E
G
-RR) is measured by
varying the V
DD
from 4.5 to 5.5 V DC and measuring
the proportion of this signal imposed on the full-scale
output voltage after subtracting the zero scale
change.
Voltage Output (OUT)
PARAMETER
Voltage output range
Output load regulation accuracy
Output short circuit current
Output voltage, low level
Output voltage, high level
SYMBOL
V
O
I
OSC
V
OL(low)
V
OH(high)
CONDITIONS
R
L
= 10kΩ
V
O
(OUT) = 2V RL=2kΩ
OUT to V
DD
or AGND
I
O
(OUT) <= 5mA
I
O
(OUT) <= -5mA
MIN
0
TYP
MAX
V
DD
-0.4
0.5
0.25
4.75
UNIT
V
LSB
mA
V
V
20
Wolfson Microelectronics
3
WM5615
Electrical Characteristics
(continued)
V
DD
= 5.0V ±5%, V
ref =
2.048V unless otherwise stated.
Reference Input (REFIN)
PARAMETER
Input voltage range
Input resistance
Input capacitance
SYMBOL
V
I
C
I
CONDITIONS
MIN
0
10
TYP
MAX
V
DD
-2
UNIT
V
MΩ
pF
5
Digital Inputs (DIN, SCLK, CS)
PARAMETER
High level digital input voltage
Low level digital input voltage
High level digital input current
Low level digital input current
Input capacitance
SYMBOL
CONDITIONS
V
IH
V
IL
I
IH
V
I
= V
DD
I
IL
V
I
= 0V
C
I
MIN
2.4
TYP
MAX
0.8
±1
±1
8
UNIT
V
V
µA
µA
pF
Digital Output (DOUT)
PARAMETER
Output voltage high
Output voltage low
SYMBOL
CONDITIONS
V
OH
I
O
= -2mA
V
OL
I
O
= 2mA
MIN
V
DD
-1
TYP
MAX
0.4
UNIT
V
V
Power Supply
PARAMETER
Supply voltage
Power supply current
SYMBOL
V
DD
I
DD
CONDITIONS
V
DD
= 5.5V, no load. V
ref
= 0V
All inputs = 0V or V
DD
V
DD
= 5.5V, no load. V
ref
= 2.048V
All inputs = 0V or V
DD
MIN
4.5
TYP
5
150
230
MAX
5.5
250
350
UNIT
V
µA
µA
Wolfson Microelectronics
4
WM5615
Electrical Characteristics
(continued)
V
DD
= 5.0V ±5%, V
ref =
2.048V unless otherwise stated.
Analogue Output Dynamic Performance
PARAMETER
Output slew rate
Output settling time
Glitch energy
Signal to noise + distortion
SYMBOL
CONDITIONS
SR
C
L
= 100pF R
L
= 10 kΩ
T
A
= 25
o
C
T
O
0.5 LSB C
L
= 100pF
t
S
R
L
= 2kΩ (see note 9)
DIN = All 0s to all 1s
S/(N+D)
V
ref
= 2V
pp
at 1kHz +
2.048 V DC, code 512
MIN
0.3
TYP
0.5
12.5
5
60
MAX
UNIT
V/µs
µs
nV s
dB
.
Note 9:
Settling time is the time for the output signal to remain within 0.5 LSB of the final measured value for a digital
input code change from code zero to 1023 rising and 1023 to 64 falling.
Digital Input Timing Specifications
PARAMETER
Setup time, DIN before SCLK high
Hold time, DIN valid after SCLK high
Setup time, CS low to SCLK high
Setup time CS high to SCLK high
Hold time, SCLK low to CS low
Hold time, SCLK low to CS high
Pulse duration, min. chip select pulse width height
Pulse duration, SCLK low
Pulse duration, SCLK high
SYMBOL
t
su
(DS)
t
h
(DH)
t
su
(CSS)
t
su
(CS1)
t
h
(CSHO)
t
h
(CSHI)
t
w
(CS)
t
w
(CL)
tw (CH)
MIN
45
0
1
50
1
0
20
18
18
TYP
MAX
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
Output Switching Specification
PARAMETER
Propagation delay time
SYMBOL
t
pd
(DOUT)
CONDITIONS
C
L
= 50pF
MIN
TYP
MAX
50
UNIT
ns
reference input (REFIN)
PARAMETER
Reference feedthrough
Reference input bandwidth
CONDITIONS
Input code = 00
(see note 10)
Input code = 512
(see note 10)
MIN
TYP
-80
100
MAX
UNIT
dB
kHz
Note 10:
Reference feedthrough and bandwidth are measured at the DAC output with Vref input = 2Vpp at 1kHz +
2.048V DC
Wolfson Microelectronics
5
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